1556252 - High CPU usage on AV1 video playback on youtube

Status: UNCONFIRMED

(Core :: Audio/Video: Playback, defect, P3)

Description

[falsehope]

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0

Steps to reproduce:

Playing the video https://www.youtube.com/watch?v=g5qU7p7yOY8 You should right click on the video and show stats for nerds, it should confirm you are using av01 codec. Latest FF stable on Linux Fedora was used. I was logged on to youtube.

Actual results:

There's RDD Process which takes additional 50% of one core. When I switch to another tab, it takes less than 20% while the video plays in the background.

Expected results:

The CPU usage should be similar to Chrome which is using the same decoder. Chrome takes 72% of CPU while FF takes 112%, and the difference is that RDD Process.

Comment 1

[falsehope]

When I disable RDD the CPU goes to Web Content process which then takes 90% of CPU instead of 40% as it takes with VP9. But when I switch to another tab, the CPU usage drops to normal and the video continues to play in background.

Comment 2

[Karl Tomlinson (:karlt)]

Bug 1538195 covers the additional use from RDD.

Still, the difference reported between vp9 and av1 is significant.